VALVE GP-MODULATING 1700761 - Caterpillar

Required Tools
Table 1
Required Tools    
Tooling    Item    Part
Number    Description    Qty    
A     A1     169-8373     Fluid Sampling Bottle     1    Note: Use of an incorrect oil sampling needle will result in permanent damage to the sampling port.Testing Procedure
Use the following procedure to obtain an SOS oil sample and determine the contamination of the oil in the hydraulic system.
Start the engine. Warm up the oil until the oil reaches 47° C (116° F).
Ensure that the transmission control is in the NEUTRAL position and place the throttle in the LOW IDLE position.
Remove the dust cap. Refer to Illustration 2. Obtain an oil sample from the SOS tap by using tooling (A) .
Stop the engine.
Check the hydraulic filter element for foreign materials.
Bronze colored particles give an indication of sleeve bearing failure.
Shiny steel particles give an indication of a bearing or gear failure.
Rubber particles indicate a seal failure or a hose failure.
Aluminum particles give an indication of converter wheel failure.
Plastic parts give an indication of thrust washer or rotating seal failure.Note: If any of these particles are found in the hydraulic filter element, all components of the hydraulic oil system must be cleaned. Do not use any damaged parts. Any damaged parts must be removed, and new parts must be installed.
Replace any damaged parts.
Replace the hydraulic filter element.Refer to Caterpillar Operation and Maintenance Manual, SEBU6250, "Machine Fluids Recommendations" for more information about obtaining a proper SOS oil sample, SOS Oil Analysis guidelines, oil sampling intervals, contamination control, and component life cycle management.Refer to Special Publication, PEHP6001, "How To Take A Good Oil Sample" for more information about obtaining a sample of oil.Consult your Caterpillar dealer for complete information and assistance in establishing an SOS program for your equipment.Scheduled Oil Sampling (SOS) Analysis
Effective fluid cleanliness management is the single most important factor and single greatest opportunity in maximizing component life, increasing reliability and durability, and lowering component life cycle costs. Scheduled oil sampling (SOS) is an oil analysis process designed to turn fluids analysis data into usable information that can be used to help identify impending component failures before catastrophic failure actually occurs. This information is used to manage equipment and reduce operating costs. Caterpillar has trademarked the title SOS Services in order to insure customers of the quality, consistency, and depth of Caterpillar oil analysis services. There are four categories of oil analysis:
Component Wear Rate
Oil Condition
Oil Contamination
Oil IdentificationComponent wear rate analysis evaluates the wear that is taking place inside the lubricated machine compartment. SOS Services uses the results of elemental analysis and particle count tests to evaluate the wear. Elemental analysis with a spectrometer measures wear particles that are less than 10 microns in size. Particle Count analysis with light blocking technology measures particles from 4 microns to 50 microns. Trend analysis and proprietary wear tables are then used to determine if wear rates are normal or abnormal.Oil condition analysis is used to determine if the oil has degraded. Tests are done to look at